linux-kernel - Re: [PATCH v7 0/6] xen/arm/arm64: CONFIG_PARAVIRT and stolen ticks accounting

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Message-ID: <20130628160156.GH1643@arm.com>
Date:	Fri, 28 Jun 2013 17:01:56 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Marc Zyngier <Marc.Zyngier@....com>,
	Will Deacon <Will.Deacon@....com>,
	Ian Campbell <Ian.Campbell@...rix.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Olof Johansson <olof@...om.net>,
	"arnd@...db.de" <arnd@...db.de>
Subject: Re: [PATCH v7 0/6] xen/arm/arm64: CONFIG_PARAVIRT and stolen ticks
 accounting

On Fri, Jun 28, 2013 at 04:58:40PM +0100, Konrad Rzeszutek Wilk wrote:
> On Fri, Jun 28, 2013 at 12:19:54PM +0100, Stefano Stabellini wrote:
> > Hi all,
> > this patch series introduces stolen ticks accounting for Xen on ARM and
> > ARM64.
> > Stolen ticks are clocksource ticks that have been "stolen" from the cpu,
> > typically because Linux is running in a virtual machine and the vcpu has
> > been descheduled.
> > To account for these ticks we introduce CONFIG_PARAVIRT and pv_time_ops
> > so that we can make use of:
> > 
> > kernel/sched/cputime.c:steal_account_process_tick
> > 
> > 
> > Stefano Stabellini (6):
> >       xen: move xen_setup_runstate_info and get_runstate_snapshot to drivers/xen/time.c
> >       kernel: missing include in cputime.c
> >       arm: introduce CONFIG_PARAVIRT, PARAVIRT_TIME_ACCOUNTING and pv_time_ops
> >       arm64: introduce CONFIG_PARAVIRT, PARAVIRT_TIME_ACCOUNTING and pv_time_ops
> >       core: remove ifdef CONFIG_PARAVIRT
> >       xen/arm: account for stolen ticks
> > 
> >  arch/arm/Kconfig                  |   20 ++++++++
> >  arch/arm/include/asm/paravirt.h   |   20 ++++++++
> >  arch/arm/kernel/Makefile          |    1 +
> >  arch/arm/kernel/paravirt.c        |   25 ++++++++++
> >  arch/arm/xen/enlighten.c          |   21 +++++++++
> >  arch/arm64/Kconfig                |   20 ++++++++
> >  arch/arm64/include/asm/paravirt.h |   20 ++++++++
> >  arch/arm64/kernel/Makefile        |    1 +
> >  arch/arm64/kernel/paravirt.c      |   25 ++++++++++
> >  arch/ia64/xen/time.c              |   48 +++-----------------
> >  arch/x86/xen/time.c               |   76 +------------------------------
> 
> This is going to hit some of the patches that David
> has sent to tglx, I think. You might want to try to rebase on top
> of them (tip/time/for-xen, or something like that ) when they
> are ready.
> 
> But for the Xen generic maintainer I am OK with these changes
> so you can stick Acked-by on them.
> 
> Are you thinking to push them yourself or via the arm64 maintainer?

Once the core Xen support is pushed via the arm64 tree (queued for
3.11-rc1), I'm happy for the subsequent Xen patches to go directly
(similarly for KVM). But it's -rc7 now and I'm not taking any more
patches for the upcoming merging window (unless they are fixes).

-- 
Catalin
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